dynamic buttons and event handlers

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Chris Larson 48 posts 63 karma points

Oct 23, 2009 @ 05:38
0

Dynamic Buttons and Event Handlers
Does anyone have experience with adding a dynamic button and attaching an event handler to that button in Umbraco? I have tried a couple different methods for creating buttons dynamically and get the buttons to render properly, but I'm having problems getting an event handler attached to them. Any suggestions would be welcome.

Sample Code [vb]:
```
Public Function RenderButton() As String
   Dim _button as New Button
   _button.Text = "Submit"
   AddHandler _button.Click, AddressOf CustomEventHandler
   Dim _TextWriter as New System.IO.StringWriter
   Dim _Renderer as New HtmlTextWriter = New HtmlTextWriter(_TextWriter)
   _button.RenderControl(_Renderer)
   Return _TextWriter
End Function
Public Sub CustomEventHandler(ByVal s as Object, ByVal e as EventArgs)
   ' do some event handling here
End Sub
```
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Richard Soeteman 4049 posts 12922 karma points MVP 2x

Oct 23, 2009 @ 09:27
0
Hi Chris,

I see a few things.

1. When you create a control (in your case a button) you need to do that in the Page_Init event.
2, A dynamic control must have an ID
3. The control must exist on the controltree.

I would Modify the code below you find an example. Can't test it so the compiler might complain :)
```
Protected  Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
 
Dim _button As New Button
_button.ID = 
"SubmitButtonID"
_button.Text = "Submit"
Controls.Add(_button)
 AddHandler _button.Click, AddressOf CustomEventHandler
 
End Sub
 Public Sub CustomEventHandler(ByVal s As Object, ByVal e As EventArgs)
 
' do some event handling here
 End Sub
 
```
Hope it helps you,

Richard
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Chris Larson 48 posts 63 karma points

Oct 23, 2009 @ 23:33

0

I knew I was missing something. Page_Init makes a huge difference.

Tks Richard.

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